Check in lists of trybots that are appropriate to run in various circumstances.

Usage: gcl try --bot=$(svn cat http://skia.googlecode.com/svn/trunk/trybots_to_run/depsroll)
Review URL: https://codereview.appspot.com/6192060

git-svn-id: http://skia.googlecode.com/svn/trunk@3868 2bbb7eff-a529-9590-31e7-b0007b416f81

trybots_to_run/README.txt

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+This directory contains a few sets of trybots that are appropriate to run in various circumstances.
+See http://code.google.com/p/skia/wiki/ChromeTrybots and http://go/SkiaGardenerStepByStep .
+
+depsroll: these are the trybots we should run before committing a Skia DEPS roll into Chrome
+layout: a smaller set to exercise most layout tests

trybots_to_run/depsroll

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+android,linux,linux_asan,linux_chromeos,linux_chromeos_asan,linux_gpu,linux_heapcheck,linux_layout,linux_layout_rel,linux_shared,mac,mac_asan,mac_gpu,mac_layout,mac_layout_rel,win,win_gpu,win_layout,win_layout_rel

trybots_to_run/layout

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+linux_layout,mac_layout,win_layout